i would say from what Ive read in your post is that"lets take for example with these illustration we feel the heat inside are car painted black, why because black absorbs and in a car painted white we don't feel it much.
if we can feel the heat from this ground level on earth while in a black painted car , how do you think the heat will be felt compared to the heights of an air plane in the sky.
it would be much hotter there, so i think the white paint is to prevent heat from the sun while the plane is in the air so as to keep passengers comfortable while traveling.
Thanks for your contribution to the topic of dicsussion. I do appreciate it.
OK ,its really a nice work you did